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Absorption
The taking in or soaking up of substances into the body of another by molecular or Chemical action (As a tree roots absorb dissolved nutrients in the soil).
Adsorption
The gathering of a gas, liquid, or dissolved substance on the surface or interface zone of another material.
Aerobes
Bacteria that must have dissolved oxygen (DO) to survive.  Aerobes are aerobic bacteria.
Ambient Temperature
Temperature of the surroundings.
Anaerobes
Bacteria that do not need dissolved oxygen (DO) to survive.
Benzene
An aromatic hydrocarbon (C6H6) that is colorless, volatile, flammable liquid. Benzene is obtained chiefly from coal tar and is used as a solvent for resins and fats and in the manufacturing of dyes.  Benzene has been found to cause cancer in humans.
Biomass
A mass of clump of organic material consisting of living organisms feeding on wastes, dead organisms, and other debris.  
Also see ZOOGLEAL MASS  and             ZOOGLEAL MAT (FILM)
Blockout
The physcial prevention of the operation of equipment.
Electrolyte
A substance that dissociates (seperates) into two or more ions when it is dissolved in water.
Electrolytic Process
A process that causes the decomposition of a chemical compound by the use of electricity.
Facultative Bacteria
Facultative bacteria can either dissolved oxygen obtained from food materials such as sulfate or nitrate ions.  In other words, facultative bacteria can live under aerobic, anoxic, or anaerobic conditions.
Indole
An organic compound (C8H7N) containing nitrogen that has an ammonia odor.
Material Safety Data Sheet (MSDS)
A document that provides pertinent information and a profile of a particular hazardous substance or mixture. An MSDS is normally developed by the manufacture of formulator of the hazardous substance of mixture. The MSDS is required to be made available to employees and operators or inspectors whenever there is the likelihood of the hazardous substance or mixture being introduced into the workplace.  Some manufacturers are preparing MSDSs for products that are not considered to be hazardous to show that the product or substance is not hazardous.
Mercaptans
Compounds containing sulfur that have am extreamely offencive skunk-like odor; also sometimes described as smelling like garlic or onions.
Micron
um, Micrometer or Micron. A unit of length. One millionth of a meter or one thousandth of a millimeter. One micron equals 0.00004 of an inch.
Mole
The name for the number (6.02x1023) of atoms or molecules.  
See  MOLECULAR WEIGHT
Obligated Aerobes
Bacteria that must have atmospheric or dissolved molecular oxygen to live and reproduce.
Odor Panel
A group of people used to measure odor.
Olfactometer
A device to measure odors in the field by dilutind odors with odor-free air.
Oxidation
Oxidation is the addition of oxygen, removal of hydrogen, or the removal of electrons from an element or compound; in the enviorment and in wastewater treatment process, organic matter is oxidaized to more stable substances. The opposite of REDUCTION.
Oxidation-Reduction Potential (ORP)
The electrical potential required to transfer electrons from one compound or element (the oxidant) to another compound or element (the reductant); used as a qualitative measure of the state of oxidation in water and wastewater treatment systems. ORP is measured in millivolts, with nagative values indicating a tendency to reduce compounds or elements and positive values indicating a tendency to oxidize compounds or elements.
Oxidized Organics
Organic materials that have been broken down in a biological process. Examples of these materials are cabohydrates and protiens that are broken down to simple sugars.
Ozonation
The Application of ozone to water, wastewater, or air, generally for the purposes of disinfection or odor control.
Phenolic Compounds
Organic compounds that are derivatives of benzene. Also called PHENOLS.
Reduction
Reduction is the addition of hydrogen, removal of oxygen, or the addition of electrons to an element or compound. Under anaerobic conditions (no dissolved oxygen present), sulfur compounds are reduced to odor-producing hydrogen sulfide (H2S) and other compounds. In the treatment of metal finishing wastewaters, hexavalent chromium (Cr6+) is reduced to the trivalent form (Cr3+). The opposite of OXIDATION.
Septic or Septicity
A condition produced by bacteria when all oxygen supplies are depleted. If severe, the bottom deposits produce hydrogen sulfide, the deposits and water turn black, give off foul odors, and the water has a greatly increased oxygen and chlorine demand.
Skatole
An organic compound (C9H9N) that contains nitrogen and has a fecal odor.
Stripped Odors
Odors that are released from a liquid by bubbling air through the liquid or by allowing the liquid to be sprayed or tumbled over media.
Threshold Odor
The minimum odor of a gas or water sample that can just be detected after successive dilutions with odorless gas or water. Also called ODOR THRESHOLD.
Zoogleal Mass
Jelly-like masses of bacteria found in both the trickling filter and activated sludge processes. These masses may be formed for or function as the protection against predators and for storage of food supplies. Also see BIOMASS.
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